The skeletal rod found in all chordates is called a _________.
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Q25: In both tunicates and cephalochordates,the ventral side
Q26: The ostracoderms
A)are the adult form of the
Q27: Development of the vertebrate head and sense
Q28: While several invertebrate groups (phyla)have in the
Q29: Lancelets belong to the subphylum _.
Q31: The lancelet reproduces
A)by asexual processes alone.
B)by budding.
C)sexually
Q32: "Sea squirts," the most common kind of
Q33: Pikaia gracilens,the earliest known chordate collected from
Q34: The ammocoete larvae is important in zoology
Q35: Walter Garstang's hypothesis of vertebrate evolution could
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